Am(Ⅲ)在花岗岩上的吸附行为  

Adsorption Behavior of Am(Ⅲ) on Granite

作　　者：章英杰[1] 冯孝贵[1] 梁俊福[1] 陈靖[1] 苏锐[2] 王驹[2] 刘春立[3] 

机构地区：[1]清华大学核能与新能源技术研究院,北京102201 [2]核工业北京地质研究院,北京100029 [3]北京大学化学与分子工程学院应用化学系,北京100871

出　　处：《原子能科学技术》2009年第3期215-220,共6页Atomic Energy Science and Technology

摘　　要：利用分批处理技术研究Am(Ⅲ)在甘肃北山地区地下深度约为300 m的花岗岩上的吸附行为,讨论多种因素,诸如pH,总CO32-、SO42-、腐殖酸、Am(Ⅲ)浓度等对吸附的影响,并就可能的吸附机理进行探讨。实验结果表明:随着溶液pH的升高,Am(Ⅲ)的吸附分配比增大;水相中总CO32-、SO42-和腐殖酸浓度增大,不利于Am在花岗岩上的吸附;Am以界面配合物的形式被吸附在花岗岩上,吸附行为可用Freundlich吸附等温式描述。The adsorption behavior of Am（ Ⅲ ） on granite （sampled from drilling well BS01 at Beishan （BS） area-a potential candidate site for China＇s high-level radioactive waste repository, the granite sample＇s depth about 300 m） was studied in BS03 well groundwater by a batch technique at （25±1） ℃. The influences of pH, sulphate ion, total carbonate ion, humic acid, and concentration of the Am（ Ⅲ ） on the adsorption behavior were also studied, and the possible adsorption mechanism was discussed. Experimental results show that the adsorption distribution rate of Am（ Ⅲ ） on granite increases with increasing pH of aqueous phase. The chemical composition of the groundwater is the main factor which influences the species of Am（Ⅲ） and adsorption behavior. The adsorption mechanism of Am（ Ⅲ ） on granite is surface complexation. The adsorption isotherm of Am（ Ⅲ ） on granite can be described by Freundlich＇s equation.

关 键 词：Am(Ⅲ) 吸附 花岗岩 

分 类 号：O647.3[理学—物理化学] O614.354[理学—化学]